Shearing tool



oct. 7, 1947. A. J, BRQNNER 2,428,650

SHEARING TOOL Filed may 17, 1945 Patented Oct. 7, y1947 SHEARING TOOL Anton J. Brunner, Congress Park, Ill., assignor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York Application May 17, 1945, Serial No. 594,244

9 Claims. (Cl. 164-40) This invention relates to a shearing tool and more particularly to a tool for shearing strandlike material.

In the manufacture of some electrical apparatus, sheathed and insulated conductors must be cut to predetermined lengths and, due to the fact that some of these conductors have a metallic woven sheath enclosed in a knitted or braided covering surrounding the relatively heavy layers of different density insulating material, such as rubber, through which a core extends, shearing tools for cutting these conductors must be continually sharpened due to the well-known wearing eiect of rubber. Considerable diculties have been experienced in the past in making a clean cut through these layers of different materials.

It is an object of the present invention to provide a simple and effective shearing tool having long life and relatively few parts,

In accordance with one embodiment of ,the invention, a cylindrical cutting element is mounted in a handle member and is held against a similar spring-pressed cutting element mounted in a block on which the handle member is pivoted. The spring-pressed cutting or shearing element is free to rotate in the block and the handle-supported cutting element is adjustable in the handle member whereby the cutting elements may rotate with respect one to another to present new shearing surfaces to the conductor beingv cut, whereby one sharpening operation on the elements will serve for an appreciable length of time. The means for exerting spring pressure on the spring-pressed cutting element includes a group of springs which may be adjusted so that the desired spring pressure will be exerted on the spring-pressed cutting element.

A complete understanding of the invention may be had by reference to the following detailed description when considered in conjunction with the accompanying drawings, wherein Fig. l is a front elevational view of a cutting In the drawings, wherein like reference charf acters designate the same parts in the several views, the tool is shown mounted upon a base lil, through which a machine screw II extends to threaded engagement with a block I2. The block l2 has a cylindrical aperture I3 extending through it to receive a drum or barrel I4, The barrel I4 is provided with a central guide aperture I5, which is encircled by six spring-receiving apertures I6. Attached to the left side of the block I2 (Figs. 2 and 3) is a retainer plate Il, which is held in place on the block by machine screws I8 (Fig. 4) and is threaded to receive six adjusting screws I9, the position of which may be adjusted to regulate the pressure exerted by springs 20 in the spring-receiving apertures I6 against a spring-pressed shearing element 2|. A retainer plate 22 is xed on the block I2 by means of machine screws 23-23, being spaced from the block I2 by a spacer member 24, through which the machine screws 23 extend. The retainer plate 22 has a relatively large aperture 25 formed in it in axial alignment with the guide aperture I5 in the drum or barrel I4, which is also aligned with a guide aperture 26 formed in the retainer plate I1.

Interposed between the right hand face (Figs. 3 and 4) of the block I2 and the left-hand face of the retainer plate 22 is a handle member 3l having a handle 32 fixed therein. The handle member 3I is pivoted on a pin 33 suitably xed in both the block I2 and the retainer plate 22. The handle member 3l has an aperture 34 formed in it, which communicates with a slot 35. The aperture 34 is adapted to receive a shearing element 36 of exactly the same construction as the shearing member 2| and the shearing element 36 is held in the handle member 3I by a machine screw 3l threaded into that portion of the handle member 3l to the right of the slot 35, as viewed in Fig. 1. This machine screw 31 may be manipulated to clamp the shearing element 36 in the handle member 3 I,

As pointed out hereinbefore, the shearing elements 2I and 36 are of identically the same construction, and each is provided with a central frusto-conical aperture 38, the reduced ends of which are juxtaposed to define a shearing edge in cooperation with the flat faces of the shearing elements 2| and 36. In addition to the central aperture in the shearing elements, they are provided with sockets 39 adapted to receive the ends of a suitable wrench whereby the shearing elei ment 36 may be set in an adjusted position and then fastened in the handle 3| by means of the machine screw 31. The shearing element 2| is free to rotate or to move axially in the' aperture I3 and it has been found that the shearing element 2l will rotate in its aperture when shearing operations are performed, apparently because of the gripping of thearubber insulationof the partsv being sheared against the shearing element tending 'to twist it. In this manner, the shearing V10* element 2l will present different surfaces to ef-Y fect the shearing operation. If necessaryy-theelement 2| may be rotated upon disassembling the apparatus if it is desired vto presenta new surface of the shearing element 'for' shearing 15;

action. Due to the fact that the springs exert 'v an appreciable amount of pressure against the.4V shearing element 2 I, it will be held tightly against the shearing element 36 despite the Wear between-'- the two parts as they are moved oneV relative 20 to the other.

In lthe operation ofy the tool; aninsulated and shielded conductor or any otherstrand1ike material-may beinserted through :the aligned centraly apertures in the retainer plate-l?, bar-relor drum Idfshearing elements 2| and 36-and the aperture-25 in thehandle meinbe13|-1and-the handle 32.--may then' be` manilzvul-ated-tov move -it A from y the' position shownin dot and dash lines in. Figi.y

1 toits operated-pcsitionyasshown in full lines- 30 in Fig; -1, thus; to shift the` shearing element '36 l Withrespectto the shearing-element 2| vandshear the-material between-them.

What is claimed iszr 1. `A vshearing toolV comprising'a pair or shear-v 35"y for resilientlyurging said other( shea-ring element 40 togengagej the first-mentioned shearing element;

2, A shearing tool comprisingla pair ofcylindrical shearing elementsg an oscillatable supportl foroneof said elements; a stationary support for the other of .saidi elements; and resilient means insaid' stationary support for urging the ele-ment" supported thereby into shearing engagementwth ,i said one element.

3. jAshearingtool comprising a base :block'having a bore therethrough, a tubularbalrel in said bore, a cylindrical shearing element slidablyjgand rotatably grnounted in said'ubore a second cylindrical shearing elemen t,'oscillatable means for supporting. saidgsecond 'shearing element, and springs positioned inthe body loithle' bar lelor pressing saidi mst-mentioned shearing element into operative. engagement with ,the second shear.- ing element.

4. A shearing toolv comprising a nairpf, cy1in3,. dricai snearmgenments an eseiiiatableisupport 6 forone oisaid elements, a statienary, supportfon theothen of;said.elements,v means in said oscila latablesupportfor Iclamping, the shearnelement therein, and resilient means in; sadastatonary-G support. .for pressing the elementsuppnrted thereby intdshearing rengagement with rsaid one element. Y

5. A shearingtool comprisinga base .block hav,-- ing-a bore, therethrough, a. ;tubular barrel in,said bore, a cylindricaL shearing,` e1ement,slidably, and rotatably ,mounted-in said bore; a second,.cylin-- drical shearing elemen-t, .oseillatable'imeans for supporting.,lsaidfsecond fshearingelement; springs.

4 s positioned in the body of the barrel for pressing said first-mentioned shearing element into operative engagement with the second shearing element, and means attached to said block for blocking movement of the second shearing element by the inst-mentioned shearing element.

6. A shearing tool comprising a base block having a bore therethrough, a tubular barrel in said bore, a cylindrical shearing element slidably and rotatably mounted in said bore, a second cylindrical shearing element, oscillatable means for supporting said second shearing element, springs positioned in the body oi the barrel for pressing said iirst-mentioned` shearing element into operaytix/e engagement=-with the second shearing elefdrical shearing element, oscillatable'-meansl for supporti-ng said-second shearing element, springs positioned vinv the, bodyof 'the barrel for pressing said rstamentioned shearingelement-into'operag a tiveLA engagementwith the second shearing-elemen-tra retainer plate fixed tofsaid block, and spring adjusting screws; one associated witheachg' Lspring,-threaded into said `plate-for adjusting the pressure of said iir'st-mentioned shearing element against the second shearing element` 85A shearing tool comprising a pair 'of shearing elements' having Acentral Truste-conical apertures: therein, means for-supporting ,one of saidshearf,` ing elements for oscillatory movement With;re spect to. theother shearing ele1ner1t, and means for resiliently urging said` other shearir1`g veleinent to engage the rstfmentioned, shearingielement, said, shearing .elementsbeing mounted Vlili/'ith Athe' small endsjof their aperturesinlabutting rflatioiri. c

9.2I1fifanV apparatus `Vfor cutting insulated 'con-. ductors, Ya mainjsupport block jhavinga bore. ex-

, tending therethroughfa halidlelmemloeiLIQMOtalIylE mounted on saidv block and having a bore threin,

mounted Ain Athe bore of themandle manila-en means f or xing said shearing. elementinsaidlj bore, a tubular shearing .element s s1idably,and rotatably, mounted in the .bore A,imtheblock, a., barrel shaped .lmember also. v Apositiiwhedin thei, bore1 in ,the block, ...a pluralitygot springs-mounted.: in said barrel shaped member, a retainer platesmountedonsaid block,.and a, pluralityroff threade;d,f members threaded in said @plate-gta?. adjustfthes pressure of said springs.onftheiseeondfmentioned shearing-element. r

. ANTON J ...BRUNNER-f:

a1:; FaRE- noirstolerani The following references: are iofgl recordszin; :the

file of this patent:

' UNITED; STATES/ramirez. 

